feat(plugin): implement WASM module instance pooling

[ankit98040]

Description

This PR implements module instance pooling for WASM modules. Previously, WASM module analysis was serialized using a mutex because wazero module instances are not thread-safe. This change introduces a sync.Pool to manage a pool of wasmInstances, allowing concurrent execution of Analyze and PostScan methods. This directly addresses the TODO comment in pkg/module/module.go regarding performance improvements to "improve the Analyze performance by having module instance pool".

Key changes:

• Refactored wasmModule to be a manager that holds a sync.Pool of instances.
• Introduced wasmInstance struct to hold stateful module data (api.Module, memFS, exported functions).
• Updated Analyze and PostScan to lease instances from the pool for the effective duration of the call.
• Updated Close to properly close the wazero.Runtime and cleanup resources.

Related issues

• Addresses "TODO: This is temporary solution and we could improve the Analyze performance by having module instance pool."

Related PRs

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works. (Verified that existing tests pass with the refactoring).
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).

[nikpivkin]

Hi @ankit98040 !

It looks like you have another identical PR open. Could you close one of them?